import {login,logout,getInfo} from '@/api/user'
import {getToken,setToken,removeToken} from '@/utils/auth'
import {resetRouter, asyncRoutes, anyRoutes, constantRoutes} from '@/router'  // 路由模块当中重置路由的方法
import router from '@/router';
import cloneDeep from 'lodash/cloneDeep'

const getDefaultState = () => {
  return {
    //获取token
    token: getToken(),
    //存储用户名
    name: '',
    //存储用户头像
    avatar: '',
    //服务器返回的菜单信息【根据不同的角色：返回的标记信息，数组里面的元素是字符串】
    routes:[],
    //角色信息
    roles:[],
    //按钮权限的信息
    buttons:[],
    //对比之后【项目中已有的异步路由，与服务器返回的标记信息进行对比最终需要展示的理由】
    resultAsyncRoutes:[],
    //用户最终需要展示全部路由
    resultAllRputes:[]
  }
}

const state = getDefaultState()

const mutations = {
  RESET_STATE: (state) => {
    Object.assign(state, getDefaultState())
  },
  SET_TOKEN: (state, token) => {
    state.token = token
  },
  SET_USERINFO: (state, userInfo) => {
    //用户名
    state.name = userInfo.name;
    //用户头像
    state.avatar = userInfo.avatar;
    //菜单权限标记
    state.routes = userInfo.routes;
    //按钮权限标记
    state.buttons = userInfo.buttons;
    //角色
    state.roles = userInfo.roles;
  },
  //最终计算出的异步路由
  SET_RESULTASYNCROUTES:(state,asyncRoutes)=>{
    //vuex保存当前用户的异步路由，注意，一个用户需要展示完成路由：常量、异步、任意路由
    state.resultAsyncRoutes = asyncRoutes;  
    //计算出当前用户需要展示所有路由
    state.resultAllRputes = constantRoutes.concat(state.resultAsyncRoutes,anyRoutes);
    //给路由器添加新的路由
    router.addRoutes(state.resultAllRputes)
}
}

const actions = {
  // user login
  login({ commit }, userInfo) {
    const { username, password } = userInfo
    return new Promise((resolve, reject) => {
      login({ username: username.trim(), password: password }).then(response => {
        const { data } = response
        commit('SET_TOKEN', data.token)
        setToken(data.token)
        resolve()
      }).catch(error => {
        console.log(error)
        reject(error)
      })
    })
  },
  // async login({ commit }, userInfo) {
  //   const { username, password } = userInfo
  //   const result = await login({ username, password })
  //   console.log(result)
  //   if (result.code === 20000) {
  //     commit('SET_TOKEN', result.data.token)
  //     setToken(result.data.token)
  //     return 'ok'
  //   } else {
  //     return Promise.reject(new Error('faile'))
  //   }
  // },

  // get user info
  getInfo({commit,state}) {
    return new Promise((resolve, reject) => {
      getInfo(state.token).then(response => {
        const { data } = response
        console.log("getInfo", data)
        if (!data) {
          return reject('Verification failed, please Login again.')
        }
        commit('SET_USERINFO', data)
        commit('SET_RESULTASYNCROUTES',computedAsyncRoutes(cloneDeep(asyncRoutes),data.routes));
        resolve(data)
      }).catch(error => {
        reject(error)
      })
    })
  },

  // user logout
  logout({
    commit,
    state
  }) {
    return new Promise((resolve, reject) => {
      logout(state.token).then(() => {
        removeToken() // must remove  token  first
        resetRouter()
        commit('RESET_STATE')
        resolve()
      }).catch(error => {
        reject(error)
      })
    })
  },

  // remove token
  resetToken({
    commit
  }) {
    return new Promise(resolve => {
      removeToken() // must remove  token  first
      commit('RESET_STATE')
      resolve()
    })
  }
}

//定义一个函数：两个数组进行对比，对比出当前用户到底显示哪些异步路由
const computedAsyncRoutes = (asyncRoutes,routes)=>{
  //过滤出当前用户【超级管理|普通员工】需要展示的异步路由
 return asyncRoutes.filter(item=>{
      //数组当中没有这个元素返回索引值-1，如果有这个元素返回的索引值一定不是-1 
     if(routes.indexOf(item.name)!=-1){
       //递归:别忘记还有2、3、4、5、6级路由
       if(item.children&&item.children.length){
           item.children = computedAsyncRoutes(item.children,routes);
       }
       return true;
     }
  })
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}
